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a in (-oo:+oo)
1/2 = a/6 // - a/6
1/2-(a/6) = 0
1/2-1/6*a = 0 // - 1/2
-1/6*a = -1/2 // : -1/6
a = -1/2/(-1/6)
a = 3
a = 3
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